🧲 Chapter 17: Electromagnetism – Multiple Choice Questions
Prepared by Muhammad Tayyab, Subject Specialist Physics, Govt Christian High School Daska. Based on PECTAA 2026 syllabus (National Curriculum 2023).
📖 What's Inside: This chapter covers magnetic poles, D.C motor, commutator, Earth's core layers, Oersted's discovery, and magnetic field direction. Each MCQ is presented with the correct answer and detailed explanation as per the official PECTAA 2026 Physics curriculum. Perfect for Punjab Boards (Lahore, Gujranwala, Multan, etc.) and all BISE boards across Pakistan.
📚 Related Resources – Chapter 17: Electromagnetism
Electromagnetism covers magnetic fields, right-hand grip rule, force on conductors, D.C motor, relay, loudspeaker, and Earth's magnetic field.
📖 Multiple Choice Questions (PECTAA 2026)
17.1 Which statement is true about the magnetic poles?
✅ Correct Answer: D
A single magnetic pole (magnetic monopole) cannot exist independently because magnetic poles always occur in pairs.
A single magnetic pole (magnetic monopole) cannot exist independently because magnetic poles always occur in pairs.
17.2 A D.C motor converts:
✅ Correct Answer: C
A D.C motor uses electric current to produce rotation, converting electrical energy into mechanical energy.
A D.C motor uses electric current to produce rotation, converting electrical energy into mechanical energy.
17.3 The part of a D.C motor that reverses the direction of current through the coil every half-cycle:
✅ Correct Answer: B
The split-ring commutator switches contact between the brushes every half-cycle to reverse the direction of the current and maintain continuous rotation.
The split-ring commutator switches contact between the brushes every half-cycle to reverse the direction of the current and maintain continuous rotation.
17.4 The two main layers of the Earth's core that contribute to the generation of the magnetic field are:
✅ Correct Answer: B
Heat from the solid inner core causes molten liquid metal in the outer core to flow, generating the Earth's magnetic field.
Heat from the solid inner core causes molten liquid metal in the outer core to flow, generating the Earth's magnetic field.
17.5 What does a steady electric current in a conductor generate around it?
✅ Correct Answer: C
According to Oersted's discovery, any moving electric charge or steady current in a conductor produces a magnetic field around itself.
According to Oersted's discovery, any moving electric charge or steady current in a conductor produces a magnetic field around itself.
17.6 What happens to the magnetic field direction when the direction of the current is reversed?
✅ Correct Answer: B
The orientation of the magnetic field depends directly on the current, so reversing the current flow flips the direction of the field.
The orientation of the magnetic field depends directly on the current, so reversing the current flow flips the direction of the field.
🧲 Key Concepts – Electromagnetism
Right-Hand Grip Rule (Straight Wire): Thumb = Current, Fingers = Magnetic field.
Right-Hand Grip Rule (Solenoid): Curled fingers = Current, Thumb = North pole.
Force on a Conductor: \( F = ILB \sin \theta \)
Dynamo Effect: Movement of liquid metal in Earth's core generates electric currents and magnetic field.
Unit 10Thermal Physics
Unit 11Transfer of Thermal Energy
Unit 12Waves
Unit 13Sound
Unit 14Light
Unit 15Electrostatics
Unit 16Electricity
Unit 17✨ Electromagnetism
Unit 18Electromagnetic Induction & EM Waves
Unit 19Electronics
Unit 20Atomic and Nuclear Physics
Unit 21Space and Environment
📖 Complete syllabus coverage for Class 10 Physics (PECTAA 2026) – Units 10 to 21
💡 Exam Tip:
For board exams, read each question carefully and eliminate obviously wrong options. These MCQs follow the PECTAA 2026 pattern and are prepared by Subject Specialist Muhammad Tayyab.
Created by Hira Science Academy | Aligned with PECTAA 2026 Syllabus